防爆軸流式通風機是我國八十年代在BT30-11的基礎上改進設計的新型風機，它與BT30-11風機相比具有明顯優點： ① 結構更合理； ② 性能有較大提高，全壓效力為89.5%; 

The explosion-proof axial flow fan is a new type of fan designed on the basis of bt30-11 in 1980's in China. Compared with bt30-11 fan, it has obvious advantages: 1) the structure is more reasonable; 2) the performance is greatly improved; the total pressure efficiency is 89.5%;